RCA 630TCS sudden failure (set was recapped few years ago)

[bigaudioal]

RCA 630TCS was working so good. Key word . . . WAS!!!

After a few hours of playing today I turned it off. It sat for a few minutes and then I decided to turn it back on. I got zero audio or picture. I got a faint raster that only appears in the center of the brightness control range. Turning that control to the right blacks out the raster and turning it to the left extreme - it almost acts like a focus control. Moves the raster off center at little. Also the contrast control has zero effect.

Set is rated for 2.5 amps at 117 volts. Drawing 1.9 amps. Same as when it was working normal. I have 10kV at the CRT anode, so that appears normal. Tested the rectifier tubes and all tubes in HV cage and they are all ok.

So what failure, that happened suddenly (with no bad smells, smoke, clues), would kill the picture and the sound signals, kill the contrast control, and only give me a faint raster at the center point of the brightness control even though I have 10kV at the anode? Typical vintage TV puzzle. Who can solve or give me hints??

Thanks fellas.